The future of President Trump’s executive order suspending immigration from seven predominantly Muslim countries may come down to a legal battle between his powers as commander in chief and discrimination limitations established by Congress.

A federal judge in New York issued a temporary, nationwide stay on the order late Saturday night. Lawyers, pushed along by a growing group of protesters, spent the day trying to free immigrants who were traveling when Trump’s order was released, leaving them either detained at U.S. airports or stranded overseas.

But the legality of Trump’s order won’t be completely clear until it faces more hearings in federal court as Trump’s Department of Justice squares off with a team of lawyers from civil rights and immigration advocacy groups.

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President Trump at Homeland Security for Swearing-In and Executive Orders. President Trump signed two executive orders on immigration including one that calls for the immediate construction of a wall along the U.S.-Mexico border.